Jim,
On the Ketrons (X1 & SD1) it is similar to the Tyros, but on the SD1 is an extra 'to end' button that brings an immediate very short ending.

My impression on the Tyros was the intro's and endings did not 'fit' with the style variations..... e.g. very complex/long intro, followed by a 'poor' average style variation. It looks like Peter Baartmans put more work in intro/endings than in the styles.

About the PA1XPro intro's :
#1 lets you change chords while playing.
#2 has its own chord-changes so you'd better not change them manually.
I agree many of them just are too long.

Roel